DDR Sensor

Hi,
Been using the DOS along with DDR for a month or so. 2 days ago I receive an alarm stating container 2 is empty when it is not. I tried stirring around the fluid (Triton core7 #2) with no luck. I am also receiving another error whereas my ATK low water level sensor is closed even though it is below water and now my ATK will not run. Maybe a bad optical sensor in my dos container 2 and ATK or can something else be going on here....
Thanks,
Joe

May be a bad optical then. The only way to troubleshoot at home is to check the diode bias voltage if you have a multimeter with a diode setting. The diode should read 1V between 2 and 6 and between 4 and 6

Sure. I opened a ticket with Neptune. After a couple of troubleshooting steps, I was asked to send back the DDR for service. They replaced the optical sensor and shipped back. They covered all costs. I was out the DDR for about a week.